Pyrrol-2-yl-methanone modified silica as electron acceptor for the oxidation of water catalyzed by cobalt(II) complexes

Abstract

To develop a new type of non-oxidant electron acceptors for water oxidation, 3-(methyl)phenyl-(3,5-dimethyl-1H-pyrrol-2-yl)methanone modified silica(SiO₂@py) was synthesized and used as host to Co₄O₄ cubane forming nanoparticles(SiO₂@pyCo₄). In the presence of Ru(bpy)₃ ²⁺ and under the irradiation of white LED(light emitting diode) light(10 W), SiO₂@pyCo₄ can catalyze water oxidation without extra electron acceptor(e.g., Na₂S₂O₈). Moreover, the turnover frequency(TOF) value of SiO₂@pyCo₄ is larger than that of Co₄O₄ cubane under the same conditions, and the longer lasting time of SiO₂@pyCo₄ indicates that SiO₂@py can enhance the stability of Co₄O₄ in water. Our results provide an economic route to develop dioxygen evolution systems based on the assembly of organic electron acceptor modified silica with active cobalt complexes.

Keywords

Silica / Water oxidation / Electron acceptor

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